آخرین محصولات
Three-dimensional numerical simulation for various
Distribution of oxygen isotope 18 O concentration which was labeled in lanthanum strontium manganese (LSM) – yttria-stabilized zirconia (YSZ) cathode of a solid oxide fuel cell (SOFC) is predicted through numerical simulations using a three-dimensional microstructure which was reconstructed by a focused ion beam-scanning electron …
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Current trends in the description of lanthanum strontium …
LSM, lanthanum strontium manganite; MIEC, mixed ionic-electronic conductor. ... In this study, the authors utilized SIMS to quantify the oxygen diffusivity of the 18 O isotope in LSM thin films. Tracer concentration profiles were measured to obtain the bulk diffusivity of oxygen as a function of temperature and oxygen partial pressure ...
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Carbon, oxygen, and strontium isotope geochemistry of
The carbon, oxygen, and strontium isotope compositions of carbonate rocks from the upper Miocene Kudankulam Formation, southern India, were measured to understand palaeoenvironment and carbonate diagenesis of this formation. Both carbon and oxygen isotope ratios of various carbonate phases including whole rocks, ooids, …
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Strontium Isotopes in Biological Material: A Key Tool for the
Strontium (Sr) belongs to the II group of chemical elements of the Periodic Table (alkaline earth metals) along with Beryllium, Magnesium, Calcium, Barium, and Radium, and has an atomic number Z = 38.Sr has four naturally occurring isotopes (i.e., 84 Sr, 86 Sr, 87 Sr, and 88 Sr) one of which produced by radioactive decay of 87 Rb (i.e., …
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Bioavailable Soil and Rock Strontium Isotope Data from Israel
The isotopic composition of bio-available local soils Sr in Israel, recently reported by Moffat et al. (2020a), ranges between 0.7058 and 0.7102. According to Moffat et al. (2020a) and our own ...
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Strontium (87Sr/86Sr) isotopes: A tracer for
The speciation, mobility, transport, and fate of beryllium (Be) in the terrestrial environment is poorly studied even though it is considered to be one of the most hazardous elements in the periodic table. ... Radiogenic (87 Sr/ 86 Sr) and stable (δ 88/86 Sr) strontium isotope compositions spanning a calendar year are reported for rivers from ...
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Strontium isotopic analysis of environmental microsamples by
For instance, Sr isotopic analysis has been widely used in mineral dust transport studies, provenance determination of agricultural products of plant or animal origin, and human migration studies. 10–12 In all these cases, the 87 Sr/ 86 Sr isotope ratio of the samples was related to that of the (bio-available fraction of) Sr of the soil/rock ...
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Strontium Isotopes from the Earth to the Archaeological Skeleton: …
This review covers the biogeochemical background, including the origin of strontium isotope compositions in rocks, weathering and hydrologic cycles that …
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Source of strontium in archaeological mobility studies
The strontium isotope composition of human tissues is widely used in archaeological mobility studies. However, little attention is paid to the relative contributions of terrestrial versus marine sources of strontium in these studies. ... The sources and transport of Sr and Nd isotopes in the Baltic Sea. Earth Planet Sci Lett 113(4):459–472 ...
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Neodymium and strontium isotopic constraints on soil sources in
Neodymium and strontium isotopic compositions and Sm Nd ratios are used to constrain the sources of silicate-rich soils developed on uplifted Pleistocene coral-reef limestones on Barbados, West Indies. The geographic and geologic setting of Barbados facilitates the application of these tracers to the evaluation of the following soil sources: …
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Frontiers | Stable Isotope Fractionation of Metals and Metalloids …
This work critically reviews stable isotope fractionation of essential (B, Mg, K, Ca, Fe, Ni, Cu, Zn, Mo), beneficial (Si), and non-essential (Cd, Tl) metals and metalloids in plants. The review (i) provides basic principles and methodologies for non-traditional isotope analyses, (ii) compiles isotope fractionation for uptake and translocation for …
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Strontium isotopes as tracers of ecosystem processes: theory and
The strontium (Sr) isotope method can be a powerful tool in studies of chemical weathering and soil genesis, cation provenance and mobility, and the …
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arXiv:1907.06746v2 [physics.atom-ph] 20 Nov 2019
Stron- tium has many favorable properties for studying isotope shifts, including an abundance of stable isotopes and very narrow optical transitions [9]. In addition, prior …
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Strontium isotope composition and sediment transport in the Rio …
@article{osti_4324057, title = {Strontium isotope composition and sediment transport in the Rio de la Plata estuary}, author = {Biscaye, P}, abstractNote = {Analyses of rubidium, strontium, and strontium isotope compesition were made on a set of whole, surface-sediment, carbonatefree samples from the Plata estuary, its major source rivers, and the …
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Source of strontium in archaeological mobility studies
The strontium isotope composition of human tissues is widely used in archaeological mobility studies. However, little attention is paid to the relative …
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Clay-fraction strontium and neodymium isotopes in the Indus Fan
Clay-fraction strontium and neodymium isotopes in the Indus Fan: implications for sediment transport and provenance - Volume 157 Issue 6 ... Correlations between grain size and the bulk sediment isotopic composition confirm that transport processes are influencing the bulk sediment record. This relationship, although present, …
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Strontium isotope dating of the source of Neolithic European Spondylus
Strontium Isotopes from the Earth to the Archaeological Skeleton: A Review. Journal of Archaeological Method and Theory, Vol. 13, Issue. 3, p. 135. ... Strontium isotopic evidence for prehistoric transport of gray-ware ceramic materials in the eastern Grand Canyon region, USA. Geoarchaeology, Vol. 26, Issue. 2, p. 189.
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Strontium, lead and zinc isotopes in marine cores as tracers of
Radiogenic elements, such as neodymium (Nd) and strontium (Sr), are commonly used to decipher the provenance and weathering histories of bulk siliciclastic sediments worldwide, although increasing evidence for diagenetic and sediment transport-driven bias of isotope signatures calls into question the utility of bulk isotope …
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Strontium and lead isotopes as environmental tracers in a
Lead and strontium isotopic signatures are considered effective indicators to determine different natural or anthropogenic sources of potential contaminants, with …
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Why a Standardization of Strontium Isotope Baseline …
Graustein, William C., and Armstrong, Richard L. 1983 The Use of 87 Sr/ 86 Sr to Measure Atmospheric Transport into Forested Watershed. Science 219: 2890 –292. ... Scale of human mobility in the southern Andes (Argentina and Chile): A new framework based on strontium isotopes. American Journal of Physical Anthropology, Vol. 164, …
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Major and trace element abundances, and strontium isotopes in …
Reaction-transport modelling indicates that changes in Li concentrations are principally controlled by the ratio of the weathering rate of primary minerals to the precipitation rate of secondary minerals, whereas δ Li 7 is affected by the extent of isotope fractionation during secondary mineral formation (which is dependent on mineralogy).
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Evolution of the Ratio of Strontium-87 to Strontium-86 in
Results show that the marine strontium isotope composition can be used for correlating and dating well-preserved authigenic marine sediments throughout much of the Cenozoic to a precision of ±1 million years. The strontium-87 to strontium-86 ratio in seawater increased sharply across the Cretaceous/Tertiary boundary, but this feature is not ...
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Changes in ocean chemistry show how sea level affects
A new analysis of strontium isotopes in marine sediments has enabled scientists to reconstruct fluctuations in ocean chemistry related to changing climate conditions over the past 35 million years.
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All Roads Lead to Rome: Exploring Human Migration to the …
Permission to extract, transport, and test the samples was also provided by the Servizio di Antropologia on behalf of the Ministero per i Beni e le Attività Culturali, in compliance with all relevant regulations concerning human remains from ancient Italy. ... Strontium isotope ratios from rocks, faunal remains, and human remains are available ...
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(PDF) Strontium Isotopic Evidence for Prehistoric Transport of …
Strontium Isotopic Evidence for Prehistoric Transport of Gray-Ware Ceramic Materials in the Eastern Grand Canyon Region, USA March 2011 Geoarchaeology 26(2):189 - 218
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Frontiers | Stable Strontium Isotopic Compositions of …
The stable strontium isotope ratios (δ 88 Sr) provide a new tool to identify chemical weathering reactions in terrestrial water. In this study, we investigated the spatiotemporal variations of δ 88 Sr in …
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REE distribution and Nd isotope composition of
Because the inner LCW transport large amounts of dissolved and suspended particulate material with distinctive geochemical signatures from the Hudson Strait and the ... Neodymium (Nd) and strontium (Sr) isotope compositions obtained for the five estuarine water stations, bulk sediment leachates and detrital sediments. Note that …
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Three-dimensional numerical simulation of oxygen isotope transport …
Distribution of oxygen isotope 18 O concentration which was labeled in lanthanum strontium manganese (LSM) – yttria-stabilized zirconia (YSZ) cathode of a solid oxide fuel cell (SOFC) is predicted through numerical simulations using a three-dimensional microstructure which was reconstructed by a focused ion beam-scanning electron …
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Strontium isotope evidence for a trade network between
Open Access 11 January 2021 Strontium isotope evidence for a trade network between southeastern Arabia and India during Antiquity Saskia E. Ryan, …
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Strontium 90
Depositional age. Strontium isotope data from Cenozoic carbonates of Anewetak have been used to better constrain rates of accommodation, subsidence, and relative sea-level change. Saller and Koepnick (1990) determined the strontium isotopic ratios of carbonate samples in E-1 and F-1 between depths of 370 m and the volcanic basement at 1,255 …
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